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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
// Original code is licensed as follows:
/*
* Copyright 2006-2007 Jeremias Maerki.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "fxbarcode/datamatrix/BC_C40Encoder.h"
#include <iterator>
#include "core/fxcrt/fx_extension.h"
#include "fxbarcode/common/BC_CommonBitMatrix.h"
#include "fxbarcode/datamatrix/BC_Encoder.h"
#include "fxbarcode/datamatrix/BC_EncoderContext.h"
#include "fxbarcode/datamatrix/BC_HighLevelEncoder.h"
#include "fxbarcode/datamatrix/BC_SymbolInfo.h"
#include "third_party/base/check.h"
namespace {
WideString EncodeToC40Codewords(const WideString& sb) {
wchar_t c1 = sb[0];
wchar_t c2 = sb[1];
wchar_t c3 = sb[2];
int32_t v = (1600 * c1) + (40 * c2) + c3 + 1;
wchar_t cw[2];
cw[0] = static_cast<wchar_t>(v / 256);
cw[1] = static_cast<wchar_t>(v % 256);
return WideString(cw, std::size(cw));
}
} // namespace
CBC_C40Encoder::CBC_C40Encoder() = default;
CBC_C40Encoder::~CBC_C40Encoder() = default;
CBC_HighLevelEncoder::Encoding CBC_C40Encoder::GetEncodingMode() {
return CBC_HighLevelEncoder::Encoding::C40;
}
bool CBC_C40Encoder::Encode(CBC_EncoderContext* context) {
WideString buffer;
while (context->hasMoreCharacters()) {
wchar_t c = context->getCurrentChar();
context->m_pos++;
int32_t lastCharSize = EncodeChar(c, &buffer);
if (lastCharSize <= 0)
return false;
size_t unwritten = (buffer.GetLength() / 3) * 2;
int32_t curCodewordCount = context->getCodewordCount() + unwritten;
if (!context->UpdateSymbolInfo(curCodewordCount))
return false;
int32_t available =
context->m_symbolInfo->data_capacity() - curCodewordCount;
if (!context->hasMoreCharacters()) {
if ((buffer.GetLength() % 3) == 2) {
if (available < 2 || available > 2) {
lastCharSize = BacktrackOneCharacter(context, &buffer, lastCharSize);
if (lastCharSize < 0)
return false;
}
}
while ((buffer.GetLength() % 3) == 1 &&
((lastCharSize <= 3 && available != 1) || lastCharSize > 3)) {
lastCharSize = BacktrackOneCharacter(context, &buffer, lastCharSize);
if (lastCharSize < 0)
return false;
}
break;
}
size_t count = buffer.GetLength();
if ((count % 3) == 0) {
CBC_HighLevelEncoder::Encoding newMode =
CBC_HighLevelEncoder::LookAheadTest(context->m_msg, context->m_pos,
GetEncodingMode());
if (newMode != GetEncodingMode()) {
context->SignalEncoderChange(newMode);
break;
}
}
}
return HandleEOD(context, &buffer);
}
void CBC_C40Encoder::WriteNextTriplet(CBC_EncoderContext* context,
WideString* buffer) {
context->writeCodewords(EncodeToC40Codewords(*buffer));
buffer->Delete(0, 3);
}
bool CBC_C40Encoder::HandleEOD(CBC_EncoderContext* context,
WideString* buffer) {
size_t unwritten = (buffer->GetLength() / 3) * 2;
size_t rest = buffer->GetLength() % 3;
int32_t curCodewordCount = context->getCodewordCount() + unwritten;
if (!context->UpdateSymbolInfo(curCodewordCount))
return false;
int32_t available = context->m_symbolInfo->data_capacity() - curCodewordCount;
if (rest == 2) {
*buffer += (wchar_t)'\0';
while (buffer->GetLength() >= 3)
WriteNextTriplet(context, buffer);
if (context->hasMoreCharacters()) {
context->writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
}
} else if (available == 1 && rest == 1) {
while (buffer->GetLength() >= 3)
WriteNextTriplet(context, buffer);
if (context->hasMoreCharacters()) {
context->writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
}
context->m_pos--;
} else if (rest == 0) {
while (buffer->GetLength() >= 3)
WriteNextTriplet(context, buffer);
if (available > 0 || context->hasMoreCharacters()) {
context->writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
}
} else {
return false;
}
context->SignalEncoderChange(CBC_HighLevelEncoder::Encoding::ASCII);
return true;
}
int32_t CBC_C40Encoder::EncodeChar(wchar_t c, WideString* sb) {
if (c == ' ') {
*sb += (wchar_t)'\3';
return 1;
}
if (FXSYS_IsDecimalDigit(c)) {
*sb += (wchar_t)(c - 48 + 4);
return 1;
}
if (FXSYS_IsUpperASCII(c)) {
*sb += (wchar_t)(c - 65 + 14);
return 1;
}
if (c <= 0x1f) {
*sb += (wchar_t)'\0';
*sb += c;
return 2;
}
if ((c >= '!') && (c <= '/')) {
*sb += (wchar_t)'\1';
*sb += (wchar_t)(c - 33);
return 2;
}
if ((c >= ':') && (c <= '@')) {
*sb += (wchar_t)'\1';
*sb += (wchar_t)(c - 58 + 15);
return 2;
}
if ((c >= '[') && (c <= '_')) {
*sb += (wchar_t)'\1';
*sb += (wchar_t)(c - 91 + 22);
return 2;
}
if ((c >= 60) && (c <= 0x7f)) {
*sb += (wchar_t)'\2';
*sb += (wchar_t)(c - 96);
return 2;
}
if (c >= 80) {
*sb += (wchar_t)'\1';
*sb += (wchar_t)0x001e;
int32_t encode_result = EncodeChar(c - 128, sb);
return encode_result > 0 ? encode_result + 2 : 0;
}
return 0;
}
int32_t CBC_C40Encoder::BacktrackOneCharacter(CBC_EncoderContext* context,
WideString* buffer,
int32_t lastCharSize) {
DCHECK(lastCharSize >= 0);
if (context->m_pos < 1)
return -1;
size_t count = buffer->GetLength();
if (count < static_cast<size_t>(lastCharSize))
return -1;
buffer->Delete(count - lastCharSize, lastCharSize);
context->m_pos--;
wchar_t c = context->getCurrentChar();
WideString removed;
int32_t len = EncodeChar(c, &removed);
if (len <= 0)
return -1;
context->resetSymbolInfo();
return len;
}